In case anyone needs this after the attachment expires in June 2007, the original is at http://www.redhat.com/archives/rhl-list/2005-November/msg02667.html
Firstly, Dapper compiles its kernels with GCC 4, so that's what you need to use. Also, you need to apply a patch, which I'll upload. I found it on the Web somewhere, so use at your own risk; it works for me. To apply it, issue while in the vpnclie...